You seem like a smart guy, Jim, so I hope that you already know that Currie did not know Burns at all, and was schooled in Dumfries. Furthermore, he had no experience in editorial scholarship.

This discussion need not go on endlessly; I should just like to stress that singing Burns with a long oo is perfectly fine, even for authentic Scots pronunciation, since many Scots dialects barely ever use the ue, and even for ones that do, there is a continuum between a very short ue, like the Swedish u, and a quite long ue, like the Swedish short y. But looking at your original post (on this matter), you never even said that the long oo must be avoided, so I'm not sure there's any major disagreement.

In any case, there is certainly no need in music to follow an author's peculiar pronunciations; that would be insane. I would sing Waltzing Matilda, God Save The Queen, and The Star Spangled Banner in the same accent (a native one). Obviously, to sing Burns in an English accent (or Waltzing Matilda in a French) would be absurd and off-putting, but any native accent should do fine.